# Docker Compose Configuration for Staging Deployment
# This file is used by CI/CD to deploy the application on staging servers
#
# Key differences from production docker-compose.prod.yml:
#   - Container name: mypage-staging (vs mypage-prod)
#   - Port mapping: 3031:3030 (vs 3030:3030)
#   - Network name: mypage-staging-network (vs mypage-network)
#   - Image tag: staging (vs latest)
#
# Usage:
#   1. This file is automatically copied to server by CI/CD workflow
#   2. Server pulls image from registry: docker compose -f docker-compose.staging.yml pull
#   3. Server starts container: docker compose -f docker-compose.staging.yml up -d
#
# Manual deployment (if CI/CD is not available):
#   ssh user@staging-server
#   cd /opt/mypage-staging
#   docker compose -f docker-compose.staging.yml pull
#   docker compose -f docker-compose.staging.yml up -d --force-recreate

version: '3.8'

services:
  mypage:
    # Use pre-built image from private registry with staging tag
    # This image is built and pushed by the CI/CD workflow
    # Format: REGISTRY_URL/IMAGE_NAME:TAG
    image: repository.workspace:5000/mypage:staging

    container_name: mypage-staging

    # Restart policy: always restart on failure or server reboot
    # This ensures high availability in staging
    restart: always

    # Port mapping: host:container
    # Staging runs on port 3031 to avoid conflicts with production (3030)
    # The application will be accessible at http://SERVER_IP:3031
    ports:
      - "3031:3030"

    # Staging environment variables
    environment:
      - NODE_ENV=production
      - NEXT_TELEMETRY_DISABLED=1
      - PORT=3030
      - HOSTNAME=0.0.0.0
      # Add any other staging-specific environment variables here
      # Example:
      # - DATABASE_URL=postgresql://user:pass@db:5432/mypage_staging
      # - REDIS_URL=redis://redis:6379

    # Persistent volumes for logs (optional)
    # Uncomment if your application writes logs
    volumes:
      - ./data/logs:/app/logs

    # Health check configuration
    # Docker monitors the application and marks it unhealthy if checks fail
    # If container is unhealthy, restart policy will trigger a restart
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:3030/", "||", "exit", "1"]
      interval: 30s        # Check every 30 seconds
      timeout: 10s         # Wait up to 10 seconds for response
      retries: 3           # Mark unhealthy after 3 consecutive failures
      start_period: 40s    # Grace period during container startup

    # Resource limits for staging
    # Prevents container from consuming all server resources
    # deploy:
    #   resources:
    #     limits:
    #       cpus: '1.0'         # Maximum 1 CPU core
    #       memory: 512M        # Maximum 512MB RAM
    #     reservations:
    #       cpus: '0.25'        # Reserve at least 0.25 CPU cores
    #       memory: 256M        # Reserve at least 256MB RAM

    # Network configuration
    networks:
      - mypage-staging-network

    # Logging configuration
    # Prevents logs from consuming all disk space
    logging:
      driver: "json-file"
      options:
        max-size: "10m"      # Maximum 10MB per log file
        max-file: "3"        # Keep only 3 log files (30MB total)

# Network definition
networks:
  mypage-staging-network:
    driver: bridge

# ============================================
# Staging Deployment Commands
# ============================================
#
# Pull latest image from registry:
#   docker compose -f docker-compose.staging.yml pull
#
# Start/update containers:
#   docker compose -f docker-compose.staging.yml up -d --force-recreate
#
# View logs:
#   docker compose -f docker-compose.staging.yml logs -f mypage
#
# Check health status:
#   docker inspect mypage-staging | grep -A 10 Health
#
# Stop containers:
#   docker compose -f docker-compose.staging.yml down
#
# Restart containers:
#   docker compose -f docker-compose.staging.yml restart
#
# Remove old/unused images (cleanup):
#   docker image prune -f
#
# ============================================
# Troubleshooting
# ============================================
#
# If container keeps restarting:
#   1. Check logs: docker compose -f docker-compose.staging.yml logs --tail=100
#   2. Check health: docker inspect mypage-staging | grep -A 10 Health
#   3. Verify port is not already in use: netstat -tulpn | grep 3031
#   4. Check resource usage: docker stats mypage-staging
#
# If health check fails:
#   1. Test manually: docker exec mypage-staging curl -f http://localhost:3030/
#   2. Check if Next.js server is running: docker exec mypage-staging ps aux
#   3. Verify environment variables: docker exec mypage-staging env
#